[alsa-devel] Smart 5.1 function not working on VIA VT1708S with *three* jacks on mainboard

Viliam Kubis viliam.kubis at gmail.com
Thu Jul 1 00:02:30 CEST 2010

Hello, for quite some time the "Smart 5.1" function in alsa is not working  
properly when motherboard has only 3 audio jacks.

Me and Raymond on alsa-bugtracker have been trying to solve the issue for  
a long time but were unsuccessful.

Please take a look at this alsa bug ticket:  

It contains A LOT of info on the problem + steps that we tried, which  
included patching the code.

Synthom : NO "Surround" , "Center" and "LFE" Control and switch with  
VT1708S on a motherboard with 3 audio jacks
Also NO surround sound.

speaker-test -c 4 -t wav -Dsurround40

Channels count (4) not available for playbacks: Invalid argument
Setting of hwparams failed: Invalid argument

Please advise if you can.

Thank you
Best Regards
Viliam Kubis

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